well I have a Brother MFC-J615W and have been able to print in 32 bit for some time now, thanks to installing files from here

http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/download_prn.html#top
just find your printer and install both cups and LPR driver (I found installing LPR then cups worked <-- in that order)

but I couldn't get the scanner to work even though I installed the driver found on that page...here is what I did

follow these direction while in Sudo, (so you can write to the file)

Ubuntu 9.10, 10.04, 10.10, 11.4, 11.10, 12.04, 12.10
1. Open "/lib/udev/rules.d/40-libsane.rules" file.
2. Add the following two lines to the end of the device list. (Before the line "# The following rule will disable ..."):
If there is "LABEL="libsane_rules_end"", add the following 2 lines before "LABEL="libsane_rules_end"".

The lines to be added---------------------------

# Brother scanners
ATTRS{idVendor}=="04f9", ENV{libsane_matched}="yes"
 
3. Restart the OS.